Print port for run.sh

run.sh

     > "$MTG_SECRET"
 fi
 
-echo "Proxy secret is $(cat "$MTG_SECRET")"
+echo "Proxy secret is $(cat "$MTG_SECRET"). Port is $MTG_PORT."
 
 docker ps --filter "Name=$MTG_CONTAINER" -aq | xargs -r docker rm -fv
 docker run \